Steam exhaust pipe arrangement for articulated locomotives



June-29, 1937. w. HANCE 2,085,698

STEAM EXHAUST PIPE ARRANGEMENT FOR ARTICULATED LOCOMOTIVES Filed Sept. 11, 1935 2 Sheets-Sheet 1 INVENTOR LawrencewHance L. w. HANCE June 29, 1937.

STEAM EXHAUST PIPE ARRANGEMENT FOR AHTICULATED LOCOMOTIVES Filed Sept. 11, 1935 2 Sheets-Sheet 2 INYENTOR V Lawre ncz NJ-(once cylinders of the locomotive,

Patented June 29,; 1.937

STEAM EXHAUST PHE ARRANGEMENT ARTICULATED LOCOMOTIVES Lawrence W. Hanee, Philadelphia, Pa. Application September 11, 1935, Serial No. 40,129 5 claims. (01. 105-47) .This invention relates generally to simple .Mallet articulated type locomotives and more particularly to improved steam pipes for supply inglive steam to the forward and rear pairs of Many arrangements of steam pip-es'have heretofore been proposed for simple Mallet artic ulated type locomotives. Certain of these prior arrangements have included the use of the saddle u back cavity in the rear pair of cylinders, steam being supplied to said cavity through a. pair of pipes extending along each'side of the locomotive and from which cavity steam is conducted to the forward pair of cylinders. In other arrangements it has been proposed. to eliminate the use of the saddle back cavity in the rear pair of cylinders, al

though a paired side supply pipes-to the rear cylinders is still employed.

It is an object of my invention to provide an improved and simplifiedarrangement of steam pipes whereby the disadvantages incident to the Q above-mentioned two types of piping are eliminated without, however, in anyway sacrificing the efiiciency of the flow of steam to the cylinders. A further object is to provide such a system of piping that will be economical in construction and maintenance and yet will have a high degree of rigidity combined with necessary flexibility without the necessity of heavy castings or pipes.

9 Other objects and advantages will be more apparent to those skilled in the art from the following description of the accompanying drawings in which: i

Fig. 1 is a diagrammatic side elevation of the 5 forward end of a Mallet articulated type locomotive showing in full lines my improved piping arrangement;

Fig. 2 is aplan View of the piping isolated from the locomotive structure; Figs. 3 and 4 are transverse sectionstaken respectively substantially on the lines 3-4 and 4-4 of Fig. 1;

. Fig. 5 is an enlarged fragmentary vertical section of the piping shown in Fig. 1 located immediately ahead of the: rear pair of cylinders.

a I provided with a usual steam dome 2 from which steam is supplied to front and rear pairs of cylin ders 3 and 4. Inasmuch as the construction of a 5 simple Mallet articulated type of locomotive is In the particular embodiment of the invention 7 well-known, its details of construction are not shown or described. It will suffice to state that steam is supplied from dome 2 through a pipe 5 to a superheated'header ii and thence through pipes l and 8, Fig. 3, to lateral outlets Q and i!) one at each side of the frontend of the boiler. As shown in Figs. 3 and 4, the outlet In is connected by a suitable elbow H to a longitudinal pipe l2 which communicates with a T connection ill, one leg of which connects as at M, Figs. 1 and 2, to one of the rear cylinders while the other leg E5 of the T is of reduced area and connects to a cross-over pipe I6 for supplying steam to the other of the rear cylinders through a connection ll. It will be noted that cross-over pipe It is of smaller cross-sectional area than the main supply pipe 12 and also pipe I6 is curved down beneath the boiler i as shown in Fig. 3. All of the joint connections of the pipingjust described are rigid and of simple form throughout. V

Steam is supplied to the forward pair of cylinders 3 through pipe I to lateral connection 9 and. thence through elbow l8, pipe 19 and elbow 20 which is connected thereto by a ball and socket connection 2!. The lower end of elbow 20 is connected by a ball and socket connection 22, Figs. 1 and 4, to an inwardly extending pipe 23 which in turn has an elbow 24 connected by a ball and socket joint 25 to a further elbow 2B. This latter elbow 26 extends forwardly as shown in Figs. 1 to i for rigid connection to a forwardly extending pipe 21. Pipe 21 is rigidly connected as at 28, Fig. 1, to the forward pair of cylinders 3.

From the foregoing description of the piping and of the forward pair of cylinders, it is seen that relative lateral motion between the boiler l and the forward pair of cylinders 3 will cause elbow 26, Figs. 2 and 4, which is rigidly secured at one end to pipe 21 and also supported upon a suitable cross-tie 30, to laterally move pipe 23 and thus cause elbow 2D to swing about its ball and socket joint ZI'. During this motion, ball and socket connections 22 and 25 permit such freedom of movement as is necessary.

The exhaust pipes for the rear pair of cylinders comprise as shown in Fig. 2 a cross pipe 31 having connections 32 and 33 for each of the rear pairs of cylinders,this cross pipe terminating in an elbow 33' which is connected to a pipe 34 leading to the smokebox. The exhaust pipe for the forward pair of cylinders is diagrammatically indicated at 35 and leads in any conventional manner from the front end of the forward pair of cylinders to the usual exhaust nozzle 36.

From the foregoing disclosure, it is seen that I have p ovided an extremely simple piping arrangement for the rear and forward pairs of cylinders that permits direct and efiicient supply of steam to the cylinders and which due to its simplicity readily lends itself to convenient location of the piping with respect to other elements positionedt beneath the boiler and which due to its simplicity is relatively economical in operation and maintenance. The cost of maintenance and also of installation is minimized due to the two sets of piping being separated from each other whereby it is seen that leaks or defects of one system may be repaired without in any way touching the other system, notwithstanding that the two systems are supplied from and are operated upon by common instrumentalities.

It will of course be understood that various changes in details of construction and arrangement of parts may be made by those skilled in the art without departing from the spirit of the invention as set forth in the appended claims.

:I claim:

1. The combination, in a simple Mallet articulated type locomotive having rear and forward pairs of cylinders and a boiler, comprising a. steam supply pipe leading from one side of the forward end of said boiler longitudinally to only one of the cylinders of the rear pair thereof and thence through a crossoverpipe located at the rear of said rear cylinders to the other rear cylinder, a crossover exhaust pipe located in front of said rear cylinders and connected thereto, and means independent of said steam supply pipe for the rear cylinders for supplying steam to the forward pair of cylinders.

2. The combination, in a simple Mallet articulated type locomotive having forward and. rear pairs of cylinders and a boiler, comprising a. pipe connected to one side of said boiler at the forward end thereof and extending longitudinally to the rear along the side of said boiler,

' a substantially centrally located pipe extending rearwardly from the forward pair of cylinders, means for supporting the forward portion of said central pipe in fixed relation to said forward connection from which the forward pair of cylinders is supplied.

4. The combination in a simple Mallet articulated type locomotive having rear and forward pairs of cylinders and a boiler, comprising a steam supply pipe leading from one side of the forward end of said boiler longitudinally to only one of the cylinders of the rear pair thereof and thence through a cross-over pipe to the other of said rear cylinders, and. means for supplying steam to the forward pair of cylinders including a supply pipe connected to one side of said boiler at the forward end thereof opposite to the point at which the longitudinal pipe for the rear pair of cylinders is connected, a central pipe extending rearwardly from said forward pair of cylinders, and flexibly jointed pipes located to the front of the rear pair of cylinders for connecting said central pipe and said steam supply pipe for the forward cylinders.

5. The combination in a simple Mallet arculated type locomotive having rear and forward pairs of cylinders and a boiler, comprising a steam supply pipe leading from one side of the forward end of said boiler longitudinally to only one of the cylinders of the rear pair thereof and thence through a cross-over pipe to the other rear cylinder, and means for supplying steam to the forward pair of cylinders, said longitudinal supply pipe and said cross-over pipe being connected at their adjacent ends to and supported by opposed legs of a T while the vertical leg of the T is connected to the rear cylinders thereby rigidly supporting said pipes.

LAWRENCE W. HANCE. 

